fix: strategy targeting numeric also check value field (#6774)

API returns both value and values fields. Empty values array causes ui
to think constraint doesnt have a value

This PR checks if value field exists and is empty before returning check
on values and length

frontend/src/component/feature/FeatureStrategy/FeatureStrategyConstraints/FeatureStrategyConstraints.tsx

@@ -18,7 +18,10 @@ interface IFeatureStrategyConstraintsProps {
 }
 
 const filterConstraints = (constraint: any) => {
-    if (constraint.hasOwnProperty('values')) {
+    if (
+        constraint.hasOwnProperty('values') &&
+        (!constraint.hasOwnProperty('value') || constraint.value === '')
+    ) {
         return constraint.values && constraint.values.length > 0;
     }